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首页> 外文期刊>Laser Physics: An International Journal devoted to Theoretical and Experimental Laser Research and Application >Discharged generator of singlet oxygen for oxygen-iodine laser. Transport kinetics of O-2(a(1)Delta(g)) and O-2(b(1)Sigma(+)(g)) molecules and O(P-3) atoms in Ar : O-2 and He : O-2 flows excited by a 13.56-MHz discharge
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Discharged generator of singlet oxygen for oxygen-iodine laser. Transport kinetics of O-2(a(1)Delta(g)) and O-2(b(1)Sigma(+)(g)) molecules and O(P-3) atoms in Ar : O-2 and He : O-2 flows excited by a 13.56-MHz discharge

机译：单线态氧的放电发生器，用于氧碘激光器。 Ar中的O-2（a（1）Delta（g））和O-2（b（1）Sigma（+）（g））分子和O（P-3）原子的传输动力学：O-2和He ：O-2流被13.56MHz放电激发

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To understand and reveal the basic physical factors providing the possibility of scaling of a discharged singlet oxygen generator (DSOG) in an oxygen-iodine laser, the production, and transport kinetics of metastable O-2(a(1)Delta(g)) and O-2(b(1)Sigma(+)(g)) molecules, as well as O(P-3) atoms, were investigated in Ar:O-2 and He:O-2 gas flows excited by a 13.56-MHz discharge in a wide range of pressures (4-40 Torr) and oxygen percentages. It is shown that the densities and transport kinetics of O-2(a(1)Delta(g)), O-2(b(1)Sigma(+)(g)), and O(P-3) appear similar for oxygen mixtures with argon and helium in the same conditions independent of discharge mode. Compared to pure O-2, the dilution of oxygen with an inert gas allows higher energy inputs per an oxygen molecule to achieved, especially under conditions of the homogeneous discharge mode (alpha-mode), which gives a higher efficiency of O-2(a(1)Delta(g)) excitation in Ar:O-2 and He:O-2 mixtures. But the maximum attainable yield of singlet oxygen in Ar:O-2 and He:O-2 at fixed partial O-2 pressure is found to be comparable with the O-2(a(1)Delta(g)) yield in pure oxygen at the same pressure. The reason for this is the increased three-body deactivation of O-2(a(1)Delta(g)) by atomic oxygen in the mixtures because of the greater total pressure. The estimation of the rate constant of O-2(a(1)Delta(g)) three-body quenching by O(P-3) in Ar:O-2 and He:O-2 mixtures as (1.5 +/- 0.5) x 10(-32) cm(6)/s was carried out from the analysis of transport kinetics of singlet and atomic oxygen in the discharge afterglow at high pressures exceeding similar to 10 Torr. A similar analysis for the lower pressures has revealed that losses both of metastable O-2(a(1)Delta(g)) and O-2(b(1)Sigma(+)(g)) molecules, and of O(P-3) atoms on the surface of the discharge tube, are determined by the density of each of the components. The obtained loss probabilities of O-2(a(1)Delta(g)), O-2(b(1)Sigma(+)(g)), and O(P-3) on the silica surface show that the surface loss probabilities of all the species can increase noticeably under the discharge exposure. Thus, the key parameters determining the maximal O-2(a(1)Delta(g)) yield in the DSOG are a homogeneous volumetric mode of the discharge, energy input per oxygen molecule in this mode, and a low rate of O-2(a(1)Delta(g)) quenching. Just three-body quenching of O-2(a(1)Delta(g)) by O(P-3) limits the singlet oxygen yield with increasing pressure. The fast removal of atomic oxygen both in discharge and in the earlier afterglow could provide DSOG scaling with pressure.
机译：了解并揭示基本物理因素，提供了在氧碘激光器中缩放单线态氧气发生器（DSOG）的可能性，亚稳O-2（a（1）Delta（g））的产生和传输动力学的方法和O-2（b（1）Sigma（+）（g））分子以及O（P-3）原子，在13.56激发的Ar：O-2和He：O-2气流中进行了研究-MHz的放电压力（4-40 Torr）和氧气百分比范围很广。结果表明O-2（a（1）Delta（g）），O-2（b（1）Sigma（+）（g））和O（P-3）的密度和传输动力学相似在相同条件下，与氩气和氦气混合的氧气混合物，与放电模式无关。与纯O-2相比，用惰性气体稀释氧气可以实现每个氧气分子更高的能量输入，尤其是在均质放电模式（α模式）的条件下，这可以提高O-2（在Ar：O-2和He：O-2混合物中进行a（1）Delta（g））激发。但是发现在固定的O-2分压下Ar：O-2和He：O-2中单线态氧的最大可得产量与纯净O-2（a（1）Delta（g））的产量相当在相同压力下的氧气。其原因是由于总压力较大，混合物中的原子氧增加了O-2（a（1）Delta（g））的三体失活。通过O（P-3）在Ar：O-2和He：O-2混合物中O-2（a（1）Delta（g））三体淬灭的速率常数估计为（1.5 +/-通过分析在超过10 Torr的高压下放电余辉中的单重态和原子氧的传输动力学，进行了0.5）x 10（-32）cm（6）/ s的分析。对较低压力的类似分析表明，亚稳O-2（a（1）Delta（g））和O-2（b（1）Sigma（+）（g））分子以及O（放电管表面上的P-3）原子取决于每个组件的密度。在二氧化硅表面上获得的O-2（a（1）Delta（g）），O-2（b（1）Sigma（+）（g））和O（P-3）的损失概率表明在放电条件下，所有物种的表面损失几率可能会显着增加。因此，决定DSOG中最大O-2（a（1）Delta（g））产量的关键参数是放电的均匀体积模式，此模式下每个氧分子的能量输入和低O-速率2（a（1）Delta（g））淬灭。 O（P-3）只是对O-2（a（1）Delta（g））进行三体淬灭会限制单线态氧的产生，并伴随压力的增加。在放电和较早的余辉中快速去除原子氧可为DSOG产生结垢压力。

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